Create fantasy_league.php

This code is for selecting a fantasy league team (where players have a cost for buying and each team can spend a fixed total amount of points).
This is a NP-Hard problem, so here I have used the following machine learning algorithms to optimize the selection.
1. Hill Climbing https://en.wikipedia.org/wiki/Hill_climbing
2. Simulated Annealing http://en.wikipedia.org/wiki/Simulated_annealing
3. Genetic Algorithm http://en.wikipedia.org/wiki/Genetic_algorithm